Method of engraving copper rolls for printing fabrics.



W. H. HOPE. METHOD OF ENGRAVING COPPER ROLLS FOR PRINTING FABRICS. APPLICATION FILED JUNE 4, I917.

1i 25 5 uuuuuuuuuu l m 7 Z Patented Feb. 12, 1918.

WILLIAM H. HOPE, OF PROVIDENCE, RHODE ISLAND,

Application filed June 4!, 1917.

To all whom it may concern:

Be it known that 1, WILLIAM H. Horn, a United States, residing at citizen of the Providence, in the county of Providence and 5 State of Rhode Island, have invented a new and useful Improvement in Methods of Engraving Copper Rolls for Printing Fabrics, of which the following is a specification.

This invention relates to certain new and useful improvements in method of engraving copper rolls for printing fabrics, and more particularly to an improved method of preparing the design on the design plate.

The primary object of this invention resides in the provision of a design plate which is ruled with two sets of lines, one set indicating circumferential lines relative to the copper rolls, and the other set representing lines that extend longitudinally of the rolls,

to aid in cutting the design on the rolls, the

, which respective design being painted on the plate in all the colors that are to be printed on the fabric with sullicient space being left between the component; configurations on the complete design so that when the rolls on which the design is cut are submitted to the acid etching process, the undercutting of the acid will exactly and completely remove the space provided, whereby each of the printing rolls- Will deposit sutlicient color to etl'ect a feet blend fabrics.

In the drawings-- Figure 1 is a fragmentary plan view of the in'iproved design plate, bearing a portion of a design, and

Figs. 2, 3, l. and 5 portions of the per or unlty between the colors on the represent fragmentary copper printing rolls on colored configurations of the completed design have been cut.

Referring more in detail to the drawing, the numeral designates the design carrying plate which is made from zinc, or other suitable material, and which is divided 1) the lines 2 and 3, the lines :2 extending vertically y around the roll and the lines iy or longitudinally across the l ly, the lines 2 are ruled eighteen to the HlC'ti and the lines 3 nine to the inch, Fig. l having been made to a scale twice as large for the sake of clearness and ease in understanding.

Only a portion of a design plate is shown, the same bearing, for instance, one corner of a rug pattern which is painted in all the Specification of Letters Patent.

llatcntetl Feb. 12, 129 18. Serial no. 172,606.

colors that are to appear on the printed fabric. Four colors, brown, red, green and black are here shown, although more or fewer colors may be employed if (lCSllBd. A printing roll is provided for each color, that is, there is a roll to carry the brown, another roll to carry the red, a third roll to carry the green and a fourth roll to carry the black.

As being illustativc of the method, lot the brown be the first part of the design to be transferred, The copper roll for this color is mounted in the pantograph in suitable bearings, and the design plate is also prop erly positioned on the pantograph. A properly pro1. ortioncd chisel-pointed cutter is then placed in the holder for operating upon the copper roll. The operative now takes the stylus of the punlograph and traces a line horizontally across the brown portion of the design which is on the design plate, said line representing practically one-ninth of an inch in widlh and extending over as many of the vertical lines 2 as are covered by said color. Alter this copper roll has been covered with all the traced lines 3 that are comprised within the brown color portion of the design, said roll is removed and replaced by a fresh copper roll upon which the next color is to be curried. The stylus is then moved horizontally across the next color portion of the design, as, for green color, in the manner described for the brown color, such operation cutting on the roll the configuration represented by the green color on the design plate. After the particular design represented by one color has been traced onto the copper roll, a new roll is substituted and the foregoing operation proceeded with for each color.

i ig. depicts a copper roll having the brou'n border 4 cut thereon; Fig. 3% shows another roll having a fragmentary portion 5 of the green design thereon; Fig. 4- illustrates the two corner coi'iiigurations (l of red cut thereon; and Fig. 5 discloses the config urations 7 cut on a roll by tracing the black portion of the design plate. 1

Between each cmiliguration and color is left; a'clcar of blank space, as indicated at 8, the purpose of which is to provide for the undercutting when the rolls are submitted to the acid etching process.- This space 8 is predetermined according to the character ofthe color to be used and the weight or tezr ture of the fabric to be printed, so that when instance, the

Illlll all of the rolls representin the design are placed in the printing mac iine, each of the rolls will deposit such a proportion of the color on the fabric as to completely coverthe latter or, in other words, the colors will blend and unite with each other in a clear and distinct abutting line that has no overlapping and irregular edges.

Further, the improved method is more accurate and requires less skill than the old process of engraving print rolls. The design plate is practically a true representation of the design as it will appear on the printed fabric with the exception that ,the colors and configurations on the design plate are separated by the spaces, or surrounded by the clear and uncolorcd border lines H.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. The herein described method of engraving copper rolls for printing fabrics, consisting in painting the design on a design plate in all the colors that are to appear on the printed fabric, leaving suflicient space between the several colors of the design proportionate to the undercut of the acid required in etching the particular roll, and transferring all the parts of the design of one color to one roll and'all the parts of another color to another roll.

:2. The herein described method of engraving print rolls for printing fabric, consisting in painting the design on a plate in all the colors that are to appear on the printed fabric, ruling the plate with two sets of lines angularly related, tracing the stylus of a pantograph along the lines of one, set over as many lines of the other set as are. covered by the particular color and operating the cutter in accordance with the movements of the. stylus.

It. The herein described method of en- ,egraving rolls for printing fabric, consisting in ruling a design plate with two sets of lines, one set; indicating circumfercntial lines, relative to the rolls, and the other set representing longitudinal lines, and painting the design on the plate in all the colors that are to appear on the printed fabric, tracing the. stylus ot' a pantograph along the lilies of one set over as many lines of the other set as are covered by the particular color, and operating the cutter in accordance with the movements of the stylus.

4. The herein described method of engraving rolls for printing fabric, consisting in painting the design on a plate in all the colors that are to appear on the printed fabric with a space surrounding each color equal to the undercut of the acid in the etching process to which the rolls are submitted, tracing the stylus of a pantograph over the colored portions only, and operating the cutter according to the movements of the stylus.

5. The herein described method of engraving rolls for printing fabric, consisting in painting the design on a met-.1 plate that is divided longitudinally and circumfercntially relative to the 'rolls, said design being painted in all the colors that are to appear on the painted fabric with apredetermined border line between each color, tracing the stylus of a pantograp'n over the colored portions of the design exclusive of the border lines, and operating the cutter in accordance with the stylus movements.

6. The herein described method of engraving rolls for printing fabric, consisting in painting the design on a plate in all the colors that are to appear on the printed fabric, and transferring all the like color parts of the design to a respective roll, one roll for each color, by tracing the stylus of a pantograph over the portions of like color and operating the rutter according to the stylus movements.

7. The herein described method of engra 'ing rolls for printing fabric, consisting in painting the design on a plate in all the colors that are to appear on the printed fabric and with a border for each color separating it from the adjacent color, said border being of a width predetermined according to the undercut of the acid in the etching process of the rolls, tracing the stylus of a pantograph over the portions of like color, and operating a cutter according to the stylus movements.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

WILLIAM H. HOPE.

Witnesses ADA E. HAGERTY, J. A. MILLER. 

